Based on the data provided, we can observe that the coin in question has had an average starting price of 27.6 euros in previous auctions, with an average closing price of 56.11 euros. Additionally, its condition has been described as 70 (MBC-), indicating a fairly acceptable preservation.

Considering the previous prices of this coin in past auctions, as well as its condition and the fact that it has sold in most instances, we could estimate a maximum purchase price around 70-80 euros. Given that the highest closing price was 140 euros in a future auction, and considering the upward trend in closing prices, an estimated maximum purchase price of 70-80 euros seems reasonable.

It is important to note that the final auction price will depend on various factors, such as demand at that specific time, competition from other bidders, and the buyer's willingness to pay for that particular coin.